Defensive publication

ABSTRACT

LOW CONCENTRATIONS OF CERTAIN QUATERNATED TRINUCLEAR COMPLEX CYANINE I, TRINULEAR COMPLEX MEROCYANINE II AND QUATERNATED TETANUCLEAR COMPLEX CYANINE DYES III PREVENT REDUCTION SENSITIZATION WHEN PRESENT DURING SILVER HALIDE GRAIN FORMATION, ESPECIALLY WHEN PRECIPITATING SILVER HALIDE GRAINS UNDER CONDITIONS WHICH NORMALLY RESULT IN REDUCTION SENSITIZATION. IN CERTAIN EMBODIMENTS, THE EFFECT IS OBTAINED WITH CONCENTRATIONS OF THE DYES WELL BELOW THE EFFECTIVE SPECTRAL-SENSITIZING CONCENTRATIONS, E.G., OF THE ORDER OF 0.1 TO 25 MG. OF DYE PER MOLE OF SILVER HALIDE FORMED IN THE PRECIPITATION. EXAMPLES OF USEUFL DYES INCLUDE:   IN ONE EMBODIMENT OF THIS INVENTION, SILVER HALIDE GRAINS CAN BE PREPARED, IN THE PRESENCE OF SAID DYES AT A PH NUMBER OF ABOUT 4 AND PREFERABLY ABOVE 6 AND/OR A PAG OF LESS THAN 9.0, WHICH ARE SUBSTANTIALLY FREE OF REDUCTION SENSITIZATION, ESPECIALLY WHEN MAKING CUBIC-REGULAR GRAINS.

EFENS E ULlCATlUN UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0G. 687. The abstracts 01! Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification. including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Oiiice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED JUNE 22, 1971 T887,029 PREPARATION OF SILVER HALIDE MATERIALS Cynthia Geer Ulbing, Fairport, N.Y. Eastman Kodak Co., Kodak Park Division, Rochester, NY. 14650) Filed Aug. 31, 1970, Ser. No. 68,524 Int. Cl. G03c 1/08, 1/12 US. Cl. 96-127 No Drawing. 13 Pages Specification Low concentrations of certain quaternated trinuclear complex cyanine I, trinuclear complex merocyanine II and quaternated tetranuclear complex cyanine dyes I11 prevent reduction sensitization when present during silver halide grain formation, especially when precipitating silver halide grains under conditions which normally result in reduction sensitization. In certain embodiments, the eifect is obtained with concentrations of the dyes Well below the elfective spectral-sensitizing concentrations, e.g., of the order of 0.1 to 25 mg. of dye per mole of silver halide formed in the precipitation. Examples of useful Ph Ph 1 I In one embodiment of this invention, silver halide grains can be prepared, in the presence of said dyes at a pH number of above 4 and preferably above 6 and/or a pAg of less than 9.0, which are substantially free of reduction sensitization, especially when making cubic-regular grains. 

